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The theoretical yield of H₂ gas at STP from the reaction of 1 mole of Zn with excess HCl (Zn + 2HCl → ZnCl₂ + H₂) is:
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For the reaction 2KClO₃ → 2KCl + 3O₂, the theoretical yield of O₂ from 1 mole of KClO₃ is: